Diversity of stimulation means novelty, and novelty means challenge to thought.
 John Dewey, Democracy and Education (1916). copy citation

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Author John Dewey
Source Democracy and Education
Topic diversity novelty
Date 1916
Language English
Reference
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Weblink http://www.gutenberg.org/files/852/852-h/852-h.htm

Context

“their knowledge overspecialized; their manners fastidious rather than humane. Lack of the free and equitable intercourse which springs from a variety of shared interests makes intellectual stimulation unbalanced. Diversity of stimulation means novelty, and novelty means challenge to thought. The more activity is restricted to a few definite lines—as it is when there are rigid class lines preventing adequate interplay of experiences—the more action tends to become routine on the part of the class at a disadvantage, and capricious, aimless, and explosive on the part of the class having the materially fortunate position.” source